Oh so everything is now sanded and finished with 3000? I think you're right to be cautious about edges that come out. It's a good idea to hand compound those to be extra safe. I did a spot repair a few weeks ago and I burned through the 2 day old clear coat with a DA, which is a heck of a lot safer than a rotary buffer. But if you got to buff the entire panel then yeah it would make sense to tape the edges that stick out.